Synthesis of high thermostable silicone gels constructed with ladderlike polysilsesquioxanes

Heat-resistant silicone gels were synthesized by replacing the single main chain polymethylhydrosiloxane with reactive ladderlike polyhydrosilsesquiox ane copolymers. Because of the interaction between polydimethylsiloxane cha ins and the ladderlike polysilsesquioxanes chains, the cyclization of the p olydimethylsiloxane chains is hindered. The high thermal stability of the l adderlike polymers can improve the thermal stability of the silicone gels w ithout sacrificing their good comprehensive properties.